<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
    .container {
      width: 100vw;
      height: 100vh;
      background: url("./bg.jpg") no-repeat;
      background-size: cover;
    }
    .box {
      position: fixed;
      width: 1920px;
      height: 1080px;
      background-color: red;
      transform-origin: left top;
      left: 50%;
      top: 50%;
    }
    .top {
      width: 100px;
      height: 100px;
      background-color: hotpink;
      margin-left: 50px;
    }
    .bottom {
      width: 100px;
      height: 100px;
      background-color: skyblue;
      margin-left: 50px;
      margin-top: 50px;
    }
  </style>
  <body>
    <div class="container">
      <div class="box">
        <div class="top">111</div>
        <div class="bottom">222</div>
      </div>
    </div>
  </body>
</html>

<script>
  // 控制数据大屏放大与缩小
  let box = document.querySelector(".box");
  box.style.transform = `scale(${getScale()}) translate(-50%,-50%)`;

  // 计算缩放比例
  function getScale(w = 1920, h = 1080) {
    const ww = window.innerWidth / w;
    const wh = window.innerHeight / h;
    return ww < wh ? ww : wh;
  }

  window.onresize=()=>{
    box.style.transform = `scale(${getScale()}) translate(-50%,-50%)`;
  }
</script>
